Magnetic properties of single crystalline itinerant ferromagnet AlFe2B2
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
Single crystals of AlFe2B2 have been grown using the self-flux growth method, and then we measured the structural properties, temperature- and field-dependent magnetization, and temperature-dependent electrical resistivity at ambient as well as high pressure. The Curie temperature of AlFe2B2 is determined to be 274 K. The measured saturation magnetization and the effective moment for the paramagnetic Fe ion indicate the itinerant nature of the magnetism with a Rhode-Wohlfarth ratio MCMsat≈1.14. Temperature-dependent resistivity measurements under hydrostatic pressure show that transition temperature TC is suppressed down to 255 K for p=2.24 GPa pressure with a suppression rate of ∼−8.9 K/GPa. The anisotropy fields and magnetocrystalline anisotropy constants are in reasonable agreement with density functional theory calculations.
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This article is published as Lamichhane, Tej N., Li Xiang, Qisheng Lin, Tribhuwan Pandey, David S. Parker, Tae-Hoon Kim, Lin Zhou, Matthew J. Kramer, Sergey L. Bud'ko, and Paul C. Canfield. "Magnetic properties of single crystalline itinerant ferromagnet AlFe 2 B 2." Physical Review Materials 2, no. 8 (2018): 084408. DOI: 10.1103/PhysRevMaterials.2.084408. Posted with permission.